Dungeon of the Endless

This achievement must be obtained on 1/21, which means you have two ways to go about it. You can wait until January 21st, or you can re-set the time on your Xbox One. To change the date, unhook your One from the internet then do a hard re-set (hold the power button down for ten seconds). You should now be able to go into Settings and change the date. I don't know that the year matters, but I chose 1/21/2017.

You will have a new character available who has some pretty nice skills, so you might not want to leave this for last like I did. If you keep him alive for three floors and/or finish the game with him, he will become permanently unlocked like your others. I don't think it matters which pod you use, but I stuck with the Escape Pod on Too Easy.

One thing to be aware of - the description of this achievement is a bit deceiving. You don't have to just "play" on 1/21; you must win a game, so instead of the two minutes I was expecting, it was closer to two hours. Also, the achievement didn't fire when I finished the game. It was not until I went back online, turned my Xbox off and on, then opened the game again that I received the achievement, so it's a bit buggy.

Here is the description of the of the guide provided by the developers for this achievement on steam:

DURATION OF THE IN-GAME EVENTS

The event starts on January 21st and ends on January 25th (midnight CET).

Dungeon of the Endless

How to unlock the archivist, Esseb Tarosh: you need to start a new game of Dungeon of the Endless. The hero will be available in your pool right away, for the duration of the event. Like any other heroes in DotE, you need to survive at least three floors with the hero or finish the game with it. If you manage to do so, once the event ends, you will be able to keep the Esseb Tarosh in your pool of heroes.

How to unlock the “Endless Day” achievement: you need to start a new game in any difficulty, hire the archivist hero and keep it alive, and complete the game. Make sure you start and complete a game between January 21st and January 25th in order to get the achievement.

I tried this a few times before I got it to work so hopefully this guide helps someone else.

I played this on an original Xbox One on 9/8/2023. I went into settings and told it to forget my wireless network then hard reset the Xbox (held the power button down for 5+ seconds). Turned Xbox back on and went into setting and changed the date to 1/22/17 (I tried 1/21/23 and 1/21/21, and it didn’t work). I stayed offline and opened the game, chose Ken Massoqui and Esseb Tarosh on Escape Pod on Too Easy difficulty.

I played the whole game in one sitting. If I had to walk away, I left the game on and didn’t quit out. I made sure to keep everyone alive. During the game I recruited two more people (Kreyang and Elise). Once I finished the game (completed floor 12), I reviewed the stat screens and then quit out of the game and went back to settings and reconnected to my wireless network.

Once Xbox live was connected, I opened the game back up. During the loading of the game, Xbox said it had two sets of data for my game: one from 1/22/17 and one from 9/8/23. I selected 1/22/17, nervously. I looked at my stats which seemed to be intact and saw that the Endless Day achievement had silently popped. :)